160 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
there are two pairs of lateral rostral spines, one of which lies in advance of the 
eyes, the other just behind the posterior wall of the orbit ; on the lower face 
of the rostrum there appears just the slightest trace of a median longitudinal 
carina. The upper surface of the first or dorsal pair of carinæ is eroded ; be- 
hind the cervical groove this pair of carint converge towards one another. Just 
in front of this pair of carinæ, lying in the median line at the base of the ros- 
trum, is a small tubercle or papilla. In the interval between the first and second 
caring on each side are about four faint tubercles on the cardiac region, and on 
each side of the gastric region are four larger low tubereles, the hindmost of 
which is the largest of all. The anterior moiety of the third carina (adopting 
Wood-Mason's terminology) is well developed as a backward prolongation 
of the external orbital spine, which is long, acute, and inclined outward and 
upward. The fourth carina is also developed both anteriorly and posteriorly 
to the cervical groove, its anterior moiety being continuous with the antero- 
inferior, or branchiostegian, spine of the carapace, Barring the external orbital 
and branchiostegian spines, the anterior moieties of both the third and fourth 
carin are entire, without a trace of spine or tooth. The trend of the branchi- 
ostegian spine is nearly straight forward, its downward and outward deflection 
being very slight. With the exceptions noted above, the spaces between the 
carin of the carapace are pretty smooth. 
The abdomen is lightly sculptured for the genus to which this species be- 
longs. Only the first and sixth segments are conspicuously carinated above. 
The pleurm of the second abdominal segment are one-toothed. The telson 
exceeds the last pair of abdominal appendages, and is rather abruptly bent 
upward at the tip. 
Length, 75 mm.; cephalothorax including rostrum, 35 mm.; rostrum, 19 mm.; 
telson, 13 mm. 
Station 261, off Grenada. 340 fathoms. 1 9 with eggs. Type. 
* 1353, off Montserrat. 303 " E 
„2060, off Grenada. 291 y 1 young. 
This species is peeuliar in having the anterior moiety of the third and fourth 
carinte of the carapace well developed and continuous with the external orbital 
and branchiostegian spines respectively. In G. gilesii Wood-Mason, which 
also has the anterior portion of both the third and fourth crests developed, 
these crests are produced anteriorly into small spines independent of the 
external orbital and branchiostegian spines. 
Stylodactylus serratus A. M. Epw. 
Station 205. 334 fathoms. 3 specimens. 
* 151. 356 Li l lis 
Pantomus parvulus A. M. Epw. 
Station 134 248 fathoms. 2 specimens, 
